JP2015074398A - Non pneumatic tire - Google Patents

Abstract

To reduce weight while suppressing a decrease in strength of a connecting member. SOLUTION: First and second elastic connecting plates 21 and 22 are provided with first to third curved portions 21d to 21f and 22d to 22f that are curved in the tire circumferential direction. In the tire side view as viewed from H, a plurality of first and second elastic connecting plates are formed along the extending direction in which the bending direction of the first to third bending portions adjacent to each other in the extending direction. Are in opposite directions, and in each of the first and second elastic connecting plates, inflection parts 21g, 21h, 22g, 22h located between the first to third bending parts adjacent to each other in the extending direction are The cross-sectional area is smaller than other parts. [Selection] Figure 1

Description

  The present invention relates to a non-pneumatic tire that does not need to be filled with pressurized air when used.

In a conventional pneumatic tire that is used while being filled with pressurized air, the occurrence of puncture is an unavoidable problem in structure.
In order to solve such problems, in recent years, for example, as shown in Patent Document 1 below, an attachment body attached to an axle, an outer cylinder body that surrounds the attachment body from the outside in the tire radial direction, an attachment body, There has been proposed a non-pneumatic tire including a connecting member that displaceably connects an outer cylindrical body.

JP 2011-156905 A

  However, the conventional non-pneumatic tire has room for improvement in terms of weight reduction while suppressing a decrease in strength of the connecting member.

  The present invention has been made in consideration of such circumstances, and an object of the present invention is to provide a non-pneumatic tire that can be reduced in weight while suppressing a decrease in strength of a connecting member.

  In order to solve the above problems and achieve such an object, a non-pneumatic tire of the present invention includes an attachment body attached to an axle, and an outer cylinder body surrounding the attachment body from the outside in the tire radial direction. A connecting member that displaceably connects the attachment body and the outer cylinder body, and the connection member includes an elastic connection plate having both ends connected to the attachment body and the outer cylinder body, respectively. In the non-pneumatic tire, the elastic connecting plate includes a curved portion that curves in a tire circumferential direction, and the elastic connecting plate extends in a side view of the tire when the non-pneumatic tire is viewed from the tire width direction. A plurality of bending portions that are adjacent to each other in the extending direction, and the bending directions of the bending portions that are adjacent to each other in the extending direction are opposite to each other. In between Curved portion which is characterized in that the cross-sectional area is smaller than the other portions.

According to this invention, since the bending directions of the respective curved portions adjacent to each other in the extending direction are opposite to each other, when a compressive load in the tire radial direction is applied to the non-pneumatic tire, Since the inflection part is hardly deformed and is mainly displaced, the load applied to the inflection part is suppressed as compared with other parts in the elastic connecting plate.
And since the cross-sectional area in such an inflection part is smaller than the cross-sectional area in other parts except the above-mentioned inflection part in an elastic connection board, while preventing the fall of the intensity of a connection member, it is lightweight. Can be achieved.

  Here, the cross-sectional area of the elastic connecting plate may gradually decrease along the extending direction toward the inflection portion.

  In this case, it is possible to effectively reduce the weight while suppressing the occurrence of a location where stress is concentrated on the elastic connecting plate.

  Moreover, at least one of the size in the tire width direction and the size in the tire circumferential direction may be smaller than the other portions in the inflection portion of the elastic connecting plate.

  In this case, a non-pneumatic tire that exhibits the above-described effects can be reliably obtained.

  According to this invention, weight reduction can be achieved while suppressing a decrease in strength of the connecting member.

In one Embodiment which concerns on this invention, it is the schematic perspective view which decomposed | disassembled some non-pneumatic tires. It is the tire side view which looked at the non-pneumatic tire shown in FIG. 1 from the one side of the tire width direction. It is the side view which looked at the 1st division case body from the one side of the tire width direction among the non-pneumatic tires shown in Drawing 1, or the side view which looked at the 2nd division case body from the other side of the tire width direction. . It is an enlarged view which shows the principal part of FIG. It is an enlarged view which shows a part of 1st, 2nd division | segmentation case body of FIG. FIG. 6 is a plan view of a part of the first split case body in FIG. 5 as viewed from the other side in the tire circumferential direction, or a plan view of a part of the second split case body in FIG. 5 as viewed from one side in the tire circumferential direction. is there.

Hereinafter, an embodiment of a non-pneumatic tire according to the present invention will be described with reference to FIGS. 1 to 6.
The non-pneumatic tire 1 includes an attachment body 11 attached to an axle (not shown), an inner cylinder body 12 externally mounted on the attachment body 11, and an outer cylinder body 13 surrounding the inner cylinder body 12 from the outer side in the tire radial direction. A plurality of ring members 14 provided between the inner cylindrical body 12 and the outer cylindrical body 13 are disposed along the tire circumferential direction, and the two cylindrical bodies 12 and 13 are relatively elastically connected to each other. And a tread member 16 disposed on the outer peripheral surface side of the outer cylindrical body 13 over the entire circumference thereof.

  Here, the attachment body 11, the inner cylinder body 12, the outer cylinder body 13, and the tread member 16 are each arranged coaxially with the common shaft. Hereinafter, the common axis is referred to as an axis O, a direction along the axis O is referred to as a tire width direction H, a direction orthogonal to the axis O is referred to as a tire radial direction, and a direction around the axis O is a tire circumference. It is called direction. In addition, the attachment body 11, the inner cylinder body 12, the outer cylinder body 13, and the tread member 16 are disposed such that the center portions in the tire width direction H are aligned with each other.

  Of the ring member 14, the outer cylinder 13 is larger in size in the tire width direction H than the inner cylinder 12, that is, the width is larger. A plurality of protrusions 12a that protrude toward the inner side in the tire radial direction and extend over the entire length in the tire width direction H are disposed on the inner peripheral surface of the inner cylindrical body 12 at intervals in the tire circumferential direction. ing.

As shown in FIGS. 1 and 2, the mounting body 11 includes a mounting cylinder portion 17 to which the front end portion of the axle is mounted, an outer ring portion 18 that surrounds the mounting cylinder portion 17 from the outside in the tire radial direction, And a plurality of ribs 19 that connect the mounting cylinder portion 17 and the outer ring portion 18.
The mounting cylinder portion 17, the outer ring portion 18, and the rib 19 are integrally formed of a metal material such as an aluminum alloy. The mounting cylinder portion 17 and the outer ring portion 18 are each formed in a cylindrical shape and arranged coaxially with the axis O. The plurality of ribs 19 are arranged at equal intervals in the circumferential direction.

A plurality of key groove portions 18a that are recessed toward the inside in the tire radial direction and that extend in the tire width direction H are formed on the outer peripheral surface of the outer ring portion 18 at intervals in the tire circumferential direction. The key groove portion 18 a is opened only on one side of both ends in the tire width direction H on the outer peripheral surface of the outer ring portion 18, and the other side is closed. The protrusions 12a of the inner cylinder 12 of the ring member 14 are fitted into these key groove portions 18a.
Of the wall surfaces defining the key groove portion 18a, the pair of side wall surfaces and the bottom wall surface facing each other in the tire circumferential direction form a right angle. In addition, a pair of side wall surfaces rising from the inner peripheral surface of the inner cylindrical body 12 and a top wall surface facing the inner side in the tire radial direction out of the outer surface of the protruding portion 12a form a right angle. The sizes of the protrusion 12a and the key groove 18a in the tire circumferential direction are equal to each other.

  Here, at the edge of one side in the tire width direction H in the outer ring portion 18, a recess 18 b that is recessed toward the other side in the tire width direction H and into which the plate material 28 is fitted is located at a position corresponding to the key groove portion 18 a. Is formed. A through hole is formed in the plate member 28, and a female screw communicating with the through hole of the plate member 28 fitted in the recess 18b on a wall surface facing the one side in the tire width direction H among the wall surfaces defining the recess 18b. The part is formed. Note that a plurality of these internal thread portions and through holes are formed at intervals in the tire circumferential direction.

Then, the ring member 14 is bolted through the through hole of the plate member 28 fitted in the recess 18b in a state where the inner cylinder 12 is fitted on the attachment body 11 and the protrusion 12a is fitted in the key groove 18a. Is fixed to the attachment body 11 by screwing into the female thread portion. In this state, the ridge portion 12a includes the plate material 28 and the other end wall surface located at the other end in the tire width direction H among the wall surfaces defining the key groove portion 18a and facing the one side in the tire width direction H. It is sandwiched between.
In the outer ring portion 18, a plurality of hollow holes penetrating in the tire radial direction are arranged at intervals in the tire width direction H in a portion located between the key groove portions 18 a adjacent in the tire circumferential direction. A plurality of hole rows 18c are formed at intervals in the tire circumferential direction. The rib 19 is also formed with a hole 19a penetrating in the tire width direction H.

  The tread member 16 is formed in a cylindrical shape, and integrally covers the outer peripheral surface side of the outer cylindrical body 13 of the ring member 14 over the entire region. The tread member 16 is made of, for example, vulcanized rubber obtained by vulcanizing natural rubber or / and a rubber composition, or a thermoplastic material. Examples of the thermoplastic material include a thermoplastic elastomer or a thermoplastic resin. Examples of the thermoplastic elastomer include an amide-based thermoplastic elastomer (TPA), an ester-based thermoplastic elastomer (TPC), an olefin-based thermoplastic elastomer (TPO), a styrene-based thermoplastic elastomer (TPS), and urethane as defined in JIS K6418. Examples thereof include a thermoplastic elastomer (TPU), a crosslinked thermoplastic rubber (TPV), and other thermoplastic elastomers (TPZ). Examples of the thermoplastic resin include urethane resin, olefin resin, vinyl chloride resin, and polyamide resin. From the viewpoint of wear resistance, it is preferable to form the tread member 16 from vulcanized rubber.

The connecting member 15 connects the attachment body 11 and the outer cylinder body 13 so as to be relatively elastically displaceable. The connecting member 15 is connected to the attachment body 11 via the inner cylinder body 12. The connecting member 15 includes a first elastic connecting plate 21 and a second elastic connecting plate 22 that connect the inner cylinder 12 and the outer cylinder 13 in the ring member 14 to each other.
The connecting member 15 includes a plurality of first elastic connecting plates 21 arranged along the tire circumferential direction at a position in one tire width direction H, and the second elastic connecting plate 22 is a position in the one tire width direction H. A plurality (60 in the illustrated example) are provided along the tire circumferential direction so that a plurality of different tire width directions H are arranged along the tire circumferential direction.
That is, the plurality of first elastic connecting plates 21 are arranged at the same position in the tire width direction H along the tire circumferential direction, and the plurality of second elastic connecting plates 22 are separated from the first elastic connecting plate 21. A plurality of tires are arranged along the tire circumferential direction at the same position in the tire width direction H that is separated in the tire width direction H.

Note that the plurality of connecting members 15 are individually disposed at positions that are axially symmetric with respect to the axis O between the inner cylinder 12 and the outer cylinder 13 in the ring member 14. All the connecting members 15 have the same shape and size. Furthermore, the width of the connecting member 15 is smaller than the width of the outer cylinder 13.
The first elastic coupling plates 21 adjacent in the tire circumferential direction are not in contact with each other, and the second elastic coupling plates 22 adjacent in the tire circumferential direction are also in non-contact with each other. Further, the first elastic connecting plate 21 and the second elastic connecting plate 22 adjacent in the tire width direction H are also not in contact with each other.
The first elastic connecting plate 21 and the second elastic connecting plate 22 have the same width. The thicknesses of the first elastic connecting plate 21 and the second elastic connecting plate 22 are also equal to each other.

Here, in the first elastic connecting plate 21, one end 21a connected to the outer cylinder 13 is located on one side in the tire circumferential direction from the other end 21b connected to the inner cylinder 12, Of the two elastic connecting plates 22, one end 22 a connected to the outer cylinder 13 is located on the other side in the tire circumferential direction with respect to the other end 22 b connected to the inner cylinder 12.
Further, the one end portions 21 a and 22 a of the first elastic connecting plate 21 and the second elastic connecting plate 22 in one connecting member 15 are made to have different positions in the tire width direction H on the inner peripheral surface of the outer cylindrical body 13. And are connected to the same position in the tire circumferential direction.

In each of the first elastic connecting plate 21 and the second elastic connecting plate 22, a curved portion 21 d that curves in the tire circumferential direction at intermediate portions 21 c and 22 c located between the one end portions 21 a and 22 a and the other end portions 21 b and 22 b. 21f and 22d to 22f are formed in plural along the extending direction in which the elastic connecting plates 21 and 22 extend in a tire side view when the tire 1 is viewed from the tire width direction H. The curved portions 21d to 21f and 22d to 22f are portions having curvatures in the tire side view in the first and second elastic connecting plates 21 and 22, respectively.
In each of the elastic connecting plates 21 and 22, among the plurality of curved portions 21d to 21f and 22d to 22f, the curved directions of the curved portions 21d to 21f and 22d to 22f adjacent to each other in the extending direction are opposite to each other. It has become.

The plurality of curved portions 21d to 21f formed on the first elastic connecting plate 21 are a first curved portion 21d curved so as to project toward the other side in the tire circumferential direction, a first curved portion 21d, and one end portion. 21a and a second curved portion 21e curved so as to project toward one side in the tire circumferential direction, and located between the first curved portion 21d and the other end 21b and the tire circumference And a third bending portion 21f that is curved so as to project toward one side of the direction.
The plurality of curved portions 22d to 22f formed on the second elastic connecting plate 22 are a first curved portion 22d curved so as to project toward one side in the tire circumferential direction, a first curved portion 22d, and one end portion. 22a and the second curved portion 22e curved so as to protrude toward the other side in the tire circumferential direction, and located between the first curved portion 22d and the other end 22b and the tire circumference And a third curved portion 22f curved so as to project toward the other side of the direction.
In the illustrated example, the first bending portions 21d and 22d have larger curvature radii in the tire side view than the second bending portions 21e and 22e and the third bending portions 21f and 22f. The first curved portions 21d and 22d are disposed at the center of the first elastic connecting plate 21 and the second elastic connecting plate 22 in the extending direction.

Further, the lengths of the two elastic connecting plates 21 and 22 are equal to each other, and the other end portions 21b and 22b of the two elastic connecting plates 21 and 22 are, as shown in FIG. In the outer peripheral surface of the inner cylindrical body 12, the same angle (for example, 20 ° or more) on one side and the other side in the tire circumferential direction centering on the axis O from the position facing the one end portions 21a, 22a in the tire radial direction. 135 degrees or less), and connected to each position separated by one. Further, the first bending portions 21d and 22d, the second bending portions 21e and 22e, and the third bending portions 21f and 22f of the first elastic connecting plate 21 and the second elastic connecting plate 22 are mutually in the tire circumferential direction. The opposite direction is the same and the size is the same.
Thereby, as shown in FIG. 4, the shape of each connecting member 15 in the side view of the tire extends along the tire radial direction, and the one end portions 21 a and 22 a of both elastic connecting plates 21 and 22 are provided. It is line symmetric with respect to the imaginary line L passing through.

In the present embodiment, in each of the elastic connecting plates 21 and 22, inflection portions 21g, 21h, 22g, which are located between the curved portions 21d to 21f and 22d to 22f adjacent to each other in the extending direction, respectively. 22h has a smaller cross-sectional area perpendicular to the extending direction, that is, a cross-sectional area, than other parts. The inflection portions 21g, 21h, 22g, and 22h are boundary regions between the curved portions 21d to 21f and 22d to 22f that are adjacent to each other in the extending direction in each of the elastic coupling plates 21 and 22. In the tire side view, these adjacent curved portions 21d to 21f and 22d to 22f are regions where the bending directions are switched in opposite directions.
In each of the elastic connecting plates 21 and 22, among the plurality of curved portions 21d to 21f and 22d to 22f, the curved directions of the curved portions 21d to 21f and 22d to 22f adjacent to each other in the extending direction are opposite to each other. It has become.
In the illustrated example, the cross-sectional areas of both elastic coupling plates 21 and 22 are gradually reduced along the extending direction toward the inflection portions 21g, 21h, 22g, and 22h.
Further, in each of the elastic connecting plates 21 and 22, the inflection portions 21g, 21h, 22g, and 22h are smaller in both the size in the tire width direction H and the size in the tire circumferential direction than the other portions. .

  As shown in FIG. 6, in each of the elastic connecting plates 21 and 22, both end edges in the tire width direction H gradually move toward each other along the extending direction toward the inflection portions 21 g, 21 h, 22 g, and 22 h. It is bent in the tire width direction H so as to approach. In addition, both end edges in the tire width direction H of each of the elastic connecting plates 21 and 22 are formed in a curved shape extending continuously without having corners or steps over the entire length in the extending direction. In addition, you may form only either one of the both ends edge of the tire width direction H in both the elastic connection plates 21 and 22 in the above-mentioned curve shape.

  The size in the tire width direction H of each of the elastic connecting plates 21 and 22 gradually decreases from the one end 21a and 22a and the other end 21b and 22b toward the inflection portions 21g, 21h, 22g, and 22h, In addition, the first bending portions 21d and 22d gradually become smaller from the center in the extending direction toward the inflection portions 21g, 21h, 22g, and 22h. In addition, the size in the tire width direction H of each of the elastic connecting plates 21 and 22 is mutually equal at the center in the extending direction at the one end portions 21a and 22a, the other end portions 21b and 22b, and the first curved portions 21d and 22d. It is equivalent.

As shown in FIG. 5, in each of the elastic connecting plates 21 and 22, the inflection portions 21g, 21h, 22g, and 22h have the smallest size in the tire circumferential direction, that is, the thickness. In each of the elastic coupling plates 21 and 22, the thicknesses of the one end portions 21a and 22a and the other end portions 21b and 22b are the largest, and the thicknesses of the first curved portions 21d and 22d are the next largest.
The first to third curved portions 21d to 21f, 22d to 22f and the inflection portions 21g, 21h, 22g, and 22h are mutually in the extending direction without interposing a corner portion or a step portion in the tire side view. It is connected smoothly.

Here, in the present embodiment, the ring member 14 and the plurality of connecting members 15 are integrally formed of a synthetic resin material. The synthetic resin material may be a single resin material, a mixture containing two or more resin materials, or a mixture containing one or more resin materials and one or more elastomers. For example, additives such as an anti-aging agent, a plasticizer, a filler, or a pigment may be included.
Further, in the present embodiment, as shown in FIG. 1, the ring member 14 is divided into one side split ring member 23 located on one side in the tire width direction H and the other side division located on the other side in the tire width direction H. It is divided into a ring member 24. In the illustrated example, the ring member 14 is divided at the center in the tire width direction H.

The one-side split ring member 23 is formed integrally with the first elastic connecting plate 21, and the other-side split ring member 24 is formed integrally with the second elastic connecting plate 22.
Further, in the present embodiment, the one-side split ring member 23 and the first elastic connecting plate 21, and the other-side split ring member 24 and the second elastic connecting plate 22 are integrally formed by injection molding.
Hereinafter, a structure in which the one-side split ring member 23 and the first elastic connecting plate 21 are integrally formed is referred to as a first split case body 31, and the other-side split ring member 24 and the second elastic connecting plate 22 are integrally formed. This is referred to as a second divided case body 32.

Here, the injection molding may be a general method in which the entire first and second divided case bodies 31 and 32 are simultaneously molded separately, or the first and second divided case bodies 31 and 32. In each case, one of the one-side and other-side split ring members 23 and 24 and the first and second elastic connecting plates 21 and 22 may be insert molding in which one is used as an insert and the other is injection-molded, or so-called two colors. Molding or the like may be used.
In each of the first and second split case bodies 31 and 32, the one side and the other side split ring members 23 and 24 and the first and second elastic connecting plates 21 and 22 are formed of different materials. Alternatively, the same material may be used. Examples of this material include a metal material and a resin material, but a resin material, particularly a thermoplastic resin is preferable from the viewpoint of weight reduction.
When the entire first and second divided case bodies 31 and 32 are simultaneously injection-molded separately, a plurality of protrusions 12a formed on the inner cylindrical body 12 may be used as the gate portion.

  In each of the first and second divided case bodies 31 and 32, the center portion in the tire width direction H of the first and second elastic connecting plates 21 and 22 and the center portion in the tire width direction H of the outer cylindrical body 13 are: The inner cylindrical body 12 is smaller than the outer cylindrical body 13 in agreement with each other.

Then, the edges in the tire width direction H of the outer cylinder 13 of the one-side split ring member 23 and the outer cylinder 13 of the other-side split ring member 24 are connected by, for example, welding, fusion, or adhesion. Yes. Of these, in the case of welding, for example, hot plate welding or the like may be employed.
Further, the ends in the tire width direction H of the inner cylinder 12 of the one-side split ring member 23 and the inner cylinder 12 of the other-side split ring member 24 are separated in the tire width direction H. Thereby, it is prevented that the burr | flash generate | occur | produces in the internal peripheral surface of the inner cylinder body 12 externally fitted by the attachment body 11. FIG.

Further, the first divided case body 31 and the second divided case body 32 have the same shape and the same size as shown in FIG. 3 in a state before the connection between the 31 and 32 as described above.
And when connecting as described above, each connecting member 15 in the tire circumferential direction of each of the first divided case body 31 and the second divided case body 32 is line-symmetric as described above in the tire side view. While aligning the positions, the outer casings 13 of the first split case body 31 and the second split case body 32 are in a state where the directions of the tire width direction H of the split case bodies 31 and 32 are opposite to each other. The non-pneumatic tire 1 can be obtained by connecting the end edges in the tire width direction H while abutting each other.

As explained above, according to the non-pneumatic tire 1 according to the present embodiment, the first and second elastic connecting plates 21 and 22 respectively extend from the plurality of curved portions 21d to 21f and 22d to 22f. Since the curved directions of the curved portions 21d to 21f and 22d to 22f adjacent to each other in the direction are opposite to each other, the tire is arranged on the non-pneumatic tire 1 as indicated by a two-dot chain line in FIG. When the compressive load in the radial direction is applied, the inflection portions 21g, 21h, 22g, and 22h are not easily deformed and are mainly displaced. Therefore, in each of the first and second elastic connecting plates 21 and 22, The load applied to the inflection portions 21g, 21h, 22g, and 22h is suppressed as compared with other portions.
And the cross-sectional area in such inflection part 21g, 21h, 22g, 22h is other than the inflection part 21g, 21h, 22g, 22h in each of the 1st, 2nd elastic connection plates 21 and 22. Since it is smaller than the cross-sectional area in the portion, it is possible to reduce the weight while preventing the strength of the connecting member 15 from being lowered.

In addition, since the cross-sectional area of each of the first and second elastic connecting plates 21 and 22 gradually decreases along the extending direction toward the inflection portions 21g, 21h, 22g, and 22h, It is possible to effectively reduce the weight while suppressing the occurrence of stress concentration on the second elastic connecting plates 21 and 22.
Further, both the size in the tire width direction H and the size in the tire circumferential direction in each of the first and second elastic coupling plates 21 and 22 are smaller than the other portions in the inflection portions 21g, 21h, 22g, and 22h. Therefore, the non-pneumatic tire 1 that exhibits the above-described effects can be reliably obtained.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

For example, in the said embodiment, although the structure provided with the 1st elastic connection board 21 and the 2nd elastic connection board 22 respectively as the connection member 15 was shown, it replaces with this and the 1st connection member 15 is 1st. A configuration may be adopted in which a plurality of elastic connecting plates 21 and a plurality of second elastic connecting plates 22 are provided with different positions in the tire width direction H.
A plurality of connecting members 15 may be provided along the tire width direction H between the inner cylinder 12 and the outer cylinder 13.

Further, the other end portions 21b and 22b of the first elastic connecting plate 21 and the second elastic connecting plate 22 are, for example, sandwiched the axis O in the tire radial direction on the outer peripheral surface of the inner cylinder 12 instead of the embodiment. Or may be connected to respective positions opposite to each other, or on the outer peripheral surface of the inner cylindrical body 12, tires may be attached to the respective one end portions 21a, 22a of the first elastic connecting plate 21 and the second elastic connecting plate 22. You may connect with the position etc. which oppose in radial direction.
Further, instead of the above-described embodiment, the one end portions 21a and 22a of the both elastic connecting plates 21 and 22 may be connected to the inner peripheral surface of the outer cylindrical body 13 at different positions in the tire circumferential direction.

Furthermore, it is not necessary to provide a gap in the tire width direction H between the inner cylinder 12 of the one-side split ring member 23 and the inner cylinder 12 of the other-side split ring member 24.
Further, three or more ring members 14 may be divided in the tire width direction H or may not be divided.
Further, the ring member 14 and the plurality of connecting members 15 may not be integrally formed.
Furthermore, the ring member 14 and the connecting member 15 are not limited to those shown in the embodiment. For example, the inner cylindrical body may not be provided, and the outer cylindrical body and the attachment body may be directly connected via a connecting member so as to be relatively elastically displaceable.
Moreover, you may make small the cross-sectional area of both the elastic connection plates 21 and 22 only in the inflection part 21g, 21h, 22g, 22h in both the elastic connection plates 21 and 22, respectively.
Moreover, in the said embodiment, both the magnitude | size of the tire width direction H and the magnitude | size of a tire circumferential direction are both in the inflection parts 21g, 21h, 22g, and 22h in each elastic connecting plate 21 and 22 from another part. However, only one of these may be reduced.
Further, in each of the elastic connecting plates 21 and 22, by forming holes penetrating in the tire circumferential direction in the inflection portions 21g, 21h, 22g and 22h, the cross-sectional areas at the inflection portions 21g, 21h, 22g and 22h May be smaller than other portions.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

Next, the verification test about the effect demonstrated above was implemented.
As an example, the non-pneumatic tire 1 shown in FIGS. 1 to 6 is adopted, and as a comparative example, in the non-pneumatic tire 1 of the example, the size in the tire width direction H of each of the elastic coupling plates 21 and 22 is large. However, a non-pneumatic tire having the same size in the tire width direction H at the other end portions 21b and 22b and the entire length in the extending direction was employed.
All of these non-pneumatic tire sizes were 155 / 65R15.
Then, these two types of non-pneumatic tires were compressed in the tire radial direction, and the compression force when the connecting member was damaged was calculated by numerical analysis.
As a result, with respect to the weight of the non-pneumatic tire of the comparative example, the non-pneumatic tire 1 of the example can be reduced by 10%, and the compressive force of the non-pneumatic tire of the comparative example can be reduced. It was confirmed that the non-pneumatic tire 1 improved by 20%.

  It is possible to reduce the weight while suppressing a decrease in the strength of the connecting member.

DESCRIPTION OF SYMBOLS 1 Non-pneumatic tire 11 Attachment body 13 Outer cylinder 15 Connection member 21 1st elastic connection board 22 2nd elastic connection board 21a, 22a One end part 21b, 22b Other end part 21d, 22d 1st curved part 21e, 22e 2nd Curved portion 21f, 22f Third curved portion 21g, 21h, 22g, 22h Curved portion H Tire width direction

Claims (3)

An attachment attached to the axle;
An outer cylinder surrounding the mounting body from the outside in the tire radial direction;
A connecting member that displaceably connects the attachment body and the outer cylindrical body,
The connecting member is a non-pneumatic tire provided with an elastic connecting plate whose both ends are separately connected to the attachment body and the outer cylinder,
In the elastic connecting plate, a plurality of curved portions that are curved in the tire circumferential direction are formed along the extending direction in which the elastic connecting plate extends in a tire side view when the non-pneumatic tire is viewed from the tire width direction,
The bending directions of the bending portions adjacent to each other in the extending direction are opposite to each other,
The non-pneumatic tire characterized in that, in the elastic connecting plate, the inflection portion located between the curved portions adjacent to each other in the extending direction has a smaller cross-sectional area than other portions.   2. The non-pneumatic tire according to claim 1, wherein a cross-sectional area of the elastic connecting plate gradually decreases along the extending direction toward the inflection portion.   The at least one of the size in the tire width direction and the size in the tire circumferential direction is smaller in the inflection portion of the elastic connecting plate than in other portions. A non-pneumatic tire described in 1.

Images